Use highly reflective mulches and oil sprays
to deter aphids from landing and feeding, and
interfere with probing/feeding patterns. Straw
mulch on the soil surface also deters landings.
These methods delay virus infection rather than
totally prevent it. Reflective and straw mulches
become ineffective once plant growth covers most
of the mulch. Oil sprays need to be applied at
least weekly with good coverage of leaf surfaces,
including young, recently unfolded leaves.